Author Options:

How do I drive a 5 phase stepper motor without using an IC? Answered

OK, so I have searched on the net to find the answer to this and I can't find a suitable answer, so I am turning to everyone here :)

I have a stepper motor:

5 phase stepping motor
0.72deg/ Step
FG6-5569 01

oriental motor co.ltd

My question about this, is if there is a way to drive this motor without using an IC chip.  From what I gather this motor is a Unipolar motor, it has 5 leads.I have the components to put an H-bridge together, but I don't know if that will actually drive this motor, coupled with the fact that I am new to building circuits.  Buying an IC is not really an option at this point for me(I know they are cheap, but I have salvaged all my components and I am trying to do this without spending money).  If someone would be so kind as to give me some pointers, I would greatly appreciate it.


9 Replies

rickharris (author)2013-07-17

How fast do you need to turn it

How accurate do you need it to be

What are you trying to do with it.

Where are you in the world.

YOU could drive it with 5 switches and do everything manually.

You could cycle it with a few transistors and some timer ics but your unlikely to be able to do this at all well with a small number of components you just happen to have around or found in old equipment.

You could spend 2 or 3 $ on a microprocessor and a hand full of transistors.
Easier to buy a designed driver IC - but you already know that.

Select as Best AnswerUndo Best Answer

shilts (author)rickharris2013-07-17

It is true, I really wanted to source this from the equipment I have managed to salvage, but it really may boil down to just buying the IC's. I intend to use this motor in a CNC application so it needs to be pretty accurate, as far as speed, I don't think it will need to be all that fast. I have numerous stepper motors that are smaller in size and I was thinking about going the SLS route, I have a few laser diodes salvaged from DVD-RW drives, but that is another beast all together, at this point I am just trying to get the base and gantry made and moving. Thanks for the input!

Select as Best AnswerUndo Best Answer

rickharris (author)shilts2013-07-18

BUY it's not worth messing about when your building a machine you expect to be reliable and accurate and which will be doing useful work.

Your still going to be $1000 under the cost of buying the entire machine.

Select as Best AnswerUndo Best Answer

iceng (author)2013-07-17

A five phase stepper you must have a need for celestial alignment accuracy.

Don't expect anything but a computer to be able to manipulate rotor acceleration
for a transition and the math for an orderly deceleration prestarted  to arrive smoothly
at a destination without slip.

Select as Best AnswerUndo Best Answer

Josehf Murchison (author)2013-07-17

Weather you use a half bridge or an H bridge the 5 bridges need to be coordinated and the frequency controlled so you can control the speed. You can use feed back from the bridges to coordinate the bridges but you will need to build an oscillator for the frequency control.

Select as Best AnswerUndo Best Answer

shilts (author)Josehf Murchison2013-07-17

So with it being a 5-phase motor I would need 5 bridges total to drive the motor? Maybe I should focus on my smaller steppers at the moment, i have enough parts for two H-bridges at most...

Select as Best AnswerUndo Best Answer

shilts (author)Josehf Murchison2013-07-17

I looked on the oriental motor website, and the other one is very helpful as well, thanks!

Select as Best AnswerUndo Best Answer